Answer is B U-Boat activity
According to the article about quarterly growth in GDP in the United States since 2011, the GDP in the second quarter of 2018 <u>increased</u> by <u>3.2%</u>.
<h3>What is the GDP growth rate?</h3>
The GDP growth rate is the year-over-year (or quarterly) change in the United State's economic output, measured in percentage.
Using the GDP growth rate, it becomes possible to measure how fast an economy is growing.
Thus, we can conclude that based on the article, the GDP in the second quarter of 2018 increased by <u>3.2%</u>.
Learn more about GDP growth rate at brainly.com/question/1690575
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The development by the United States of the largest military in the world